Answer this question truthfully
### Question: What causes Severe acute respiratory syndrome?
### Response: SARS is caused by a member of the coronavirus family (the same family that can cause the common cold).
When someone with SARS coughs or sneezes, infected droplets spray into the air. You can catch SARS if you breathe in or touch these particles. The SARS virus may live on hands, tissues, and other surfaces for up to 6 hours in these droplets and up to 3 hours after the droplets have dried.
While droplet transmission through close contact was responsible for most of the early cases of SARS, evidence began to mount that SARS might also spread by hands and other objects the droplets had touched. Airborne transmission was a real possibility in some cases. Live virus had even been found in the stool of people with SARS, where it has been shown to live for up to four days. And the virus may be able to live for months or years when the temperature is below freezing.
With other coronaviruses, re-infection (becoming infected and falling ill again) is common. Preliminary reports suggest that this may also be the case with SARS.
Symptoms usually occur about 2 to 10 days after coming in contact with the virus, although there have been some cases where the illness started considerably sooner or later. Those with active symptoms of illness are clearly contagious, but it is not known how long a person may be contagious before or after symptoms.